Abstract
In this paper, an inverter using resistivecapacitive output impedance (RC-type inverter) is proposed not only to provide fast reactive power sharing to support microgrid voltage, and but also to reduce circulating currents and damp high-frequency resonances among inverters. Introducing the RC virtual impedance loop, the inverter provides fast transient response. Based on the RC-type inverter modeling, the comparative frequency-domain analysis of equivalent output impedances are discussed, and the impact of the virtual complex impedance over the circulating currents and high-frequency resonances among parallel inverters are quantitatively analyzed. The control parameters are systematically selected, and effect of virtual complex impedance on the inverter output voltage is depicted. The RC-type inverter can reduce circulating currents and damp resonances due to different equivalent output impedances of inverter, and line impedances. Simulation and experimental results verify the effectiveness of proposed method.
Original language | English |
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Journal | I E E E Transactions on Power Electronics |
Volume | 31 |
Issue number | 8 |
Pages (from-to) | 5524-5537 |
Number of pages | 14 |
ISSN | 0885-8993 |
DOIs | |
Publication status | Published - Aug 2016 |
Keywords
- Microgrid
- Resonance
- Circulating current
- Reactive power sharing
- Resistive-capacitive virtual impedance
- Parallel-connected inverters